/*
* This file is part of the CMaNGOS Project. See AUTHORS file for Copyright information
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef TSS_H
#define TSS_H

#include <boost/shared_ptr.hpp>
#include <boost/thread/tss.hpp>

#include <functional>

namespace MaNGOS
{
    template <typename T>
    class thread_local_ptr : public boost::thread_specific_ptr<T>
    {
        private:
            typedef std::function<T* ()> Generate;
            typedef std::function<void(T*)> Cleanup;

            Generate m_generator;

        public:
            thread_local_ptr() : m_generator([]() { return new T; }) {}
            thread_local_ptr(Generate generator) : m_generator(generator) {}
            thread_local_ptr(Generate generator, Cleanup cleanup) : m_generator(generator), boost::thread_specific_ptr<T>(cleanup) {}

            // this get allows for a nullptr return value
            T* get_value() { return boost::thread_specific_ptr<T>::get(); }

            T* get()
            {
                T* ret = get_value();
                if (!ret)
                {
                    ret = m_generator();
                    boost::thread_specific_ptr<T>::reset(ret);
                }
                return ret;
            }

            T* operator -> ()
            {
                return get();
            }

            typename boost::detail::sp_dereference< T >::type operator*() const
            {
                return *get();
            }
    };
}

#endif /*TSS_H*/
